Normalizing multi histogram

[faca87]

Hello, I should compare experimental data with MC simulation.
I wrote the macro and I got this plot (no-normalized)

Then I normalized the graph, by using for the MC:

hSim0->Scale(1./hSim0->Integral(), "width");

and for the experimental data

hExp0->Scale(1./hExp0->Integral(), "width");

but running the macro I get this plot

As you can see, it normalizes the graphs, but the quality of the image is very low, there isn’t the filling color

detdraw.c (2.8 KB)

[Wile_E_Coyote]

The easiest solution would be (after scaling them):
hSim0->Sumw2(kFALSE); hExp0->Sumw2(kFALSE); c01->Modified(); c01->Update();

[faca87]

Thank you @Wile_E_Coyote it woks but looking th two graphs I notice that one of them (the first one) has a noticeble difference between MC and data…I would check if it depends on the binning.
For the MC data are stored in a TTree then I can set the binning

TString hString0 = TString::Format("Edep[0]>> htemp0(7010, 0, 7010.)");

but experimental data were stored in histogram, then the binning was preset and I just get the plot

TH1F *hExp0 = (TH1F *)g->Get("GePD");

is it possible to rebin it?

[Wile_E_Coyote]

The easiest solution would be to first get the old “GePD” histogram and then use its “nbins”, “xmin”, and “xmax” to create the new “htemp0” histogram, e.g.:

gROOT->cd(); // newly created histograms should go here
TH1F *hExp0 = (TH1F*)g->Get("GePD");
TH1F *hSim0 = (TH1F*)hExp0->Clone("htemp0"); hSim0->Reset("M");
TString hString0 = TString::Format("Edep[0] >> htemp0"); t0->Draw(hString0);

[faca87]

Thank you @Wile_E_Coyote
I tried your code, but there is still that difference in one of the detectors…
maybe there is really this difference and we have to check the reason